CN111917534B - Multicast data transmission method for embedding ciphertext strategies in message - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
- H04L9/0618—Block ciphers, i.e. encrypting groups of characters of a plain text message using fixed encryption transformation
- H04L9/0631—Substitution permutation network [SPN], i.e. cipher composed of a number of stages or rounds each involving linear and nonlinear transformations, e.g. AES algorithms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/185—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with management of multicast group membership
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention discloses a multicast data transmission method for embedding ciphertext strategies in messages, and relates to the technical field of network security. The method comprises the following steps: the multicast source generates a ciphertext strategy tree according to the AES key and the decryption strategy; the multicast source encrypts the multicast data according to the AES key to generate ciphertext data; the multicast source binds the ciphertext policy tree and ciphertext data together to generate a binding data packet, and sends the binding data packet to all multicast receivers; the target multicast receiver obtains an AES key from the decryption ciphertext policy tree, and decrypts ciphertext data by adopting the AES key to obtain multicast data. The invention realizes the encryption of one-to-many multicast messages, even if an illegal receiver joins in one multicast task to acquire encrypted data, the illegal receiver cannot decrypt the multicast data from the encrypted data, and the multicast source can conveniently modify the ciphertext strategy in the same multicast task to control whether the receiver can decrypt at any time.
Description
Technical Field
The invention relates to the technical field of network security, in particular to a multicast data transmission method for embedding a ciphertext strategy in a message.
Background
With the development of the Internet, various data, voice and video information interacted in the network are more and more, and meanwhile, services such as new electronic commerce, online conference, online auction, video on demand, remote teaching and the like are most consistent with a point-to-multipoint mode, so that higher requirements are put forward on network bandwidth. The conventional unicast and broadcast communication methods cannot realize the problems of single-point transmission and multi-point reception with minimum network overhead.
The occurrence of the IP multicast technology solves the problems in time and is a point-to-multipoint transmission mode. When some users in the network need specific data, a multicast data sender (namely a multicast source) only sends the data once, a multicast distribution tree is established for a multicast data packet by means of a multicast routing protocol, and the transmitted data starts to be copied and distributed after reaching a node which is as close as possible to a user side.
IP multicasting has been developed for over a decade, and many international organizations have performed a great deal of work on technological research and service development of multicasting, and multicast communication technologies are becoming mature. However, the security of the multicast data in the network transmission process is not well guaranteed, the data is usually transmitted in the clear text on the network and is easily intercepted by a third party, and meanwhile, in the IP network, any terminal or user can easily join in a multicast task, and the verification mechanism of a multicast receiver is lacking. The traditional encryption technology can only realize the point-to-point encryption function and cannot be suitable for multicast point-to-multipoint use scenes.
Disclosure of Invention
The invention provides a multicast data transmission method for embedding a ciphertext strategy in a message, which can alleviate the problems.
In order to alleviate the problems, the technical scheme adopted by the invention is as follows:
a multicast data transmission method for embedding ciphertext strategies in messages comprises the following steps:
s1, each multicast receiver acquires the attribute of the multicast receiver and a private key corresponding to the attribute of the multicast receiver, which is generated according to a CP-ABE algorithm;
s2, the multicast source determines a target multicast receiver, randomly generates an AES key, formulates a decryption strategy according to the attribute of the target multicast receiver, and generates a ciphertext strategy tree according to strategy generation conditions, wherein the strategy generation conditions comprise the AES key and the decryption strategy;
s3, the multicast source encrypts the multicast data according to the AES key to generate ciphertext data;
s4, binding the ciphertext policy tree and ciphertext data together by the multicast source to generate a network data packet, and transmitting the network data packet to all multicast receivers;
s5, each multicast receiver analyzes the ciphertext strategy tree and ciphertext data from the network data packet;
s6, each multicast receiver decrypts the ciphertext policy tree according to the decryption condition of the multicast receiver, wherein the decryption condition comprises a private key generated according to the attribute of the multicast receiver, and only the attribute of the target multicast receiver is matched with the ciphertext policy tree and can decrypt the ciphertext policy tree to obtain an AES key;
s7, the target multicast receiver decrypts the ciphertext data by adopting the AES key to obtain plaintext multicast data.
The technical effect of the technical scheme is as follows: the encryption problem of one-to-many multicast messages is solved, the multicast source is encrypted once, and a plurality of receivers can decrypt at the same time according to the attribute, so that the multicast data is prevented from being transmitted in the clear in the network; the network behavior is not changed, an illegal receiver can still join in a multicast task in a certain mode, but because the whole multicast data is encrypted, the illegal receiver can not decrypt the data and can not acquire plaintext data even if joining the multicast to acquire the data; the multicast source can modify the decryption strategy conveniently in the same multicast task to control the decryption authority of the multicast receiver.
Further, the policy generation condition further comprises a random number and a public parameter, wherein the random number is generated by a multicast source, and the public parameter refers to a parameter required by a CP-ABE algorithm; the decryption conditions further include public parameters.
Further, the public parameters are generated by the PKG server and are disclosed in the network in which the multicast group is located.
Further, the attribute and the private key of each multicast receiver are uniformly generated by the PKG server.
The technical effect of the technical scheme is as follows: and the key pair is generated through unified management, so that the method is safe and reliable.
Further, the attribute and private key generated by the PKG server, after being stored in the Ukey, are copied offline to each multicast receiver.
The technical effect of the technical scheme is as follows: the security and confidentiality of the private key can be ensured, and interception by people in the network can be avoided.
Further, the attribute of each multicast receiver is disclosed by the PKG server in the network where the multicast group is located.
Further, the target multicast receiver requests to decrypt the multicast data in the data transmission task.
Further, the AES key is a symmetric key, and the multicast data is encrypted or decrypted by using an AES algorithm.
The technical effect of the technical scheme is as follows: the AES algorithm has high operation speed, very low memory requirement, suitability for a limited environment and flexible design of the packet length and the key length.
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a multicast data transmission method in an embodiment of the present invention;
FIG. 2 is a schematic diagram showing distribution of the attributes and private keys of multicast group members according to an embodiment of the present invention;
FIG. 3 is a schematic block diagram of an encryption process of a multicast source according to an embodiment of the present invention;
fig. 4 is a schematic block diagram of a decryption process of a target multicast receiver according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 2, fig. 3 and fig. 4, an embodiment of the present invention discloses a multicast data transmission method for embedding a ciphertext policy in a message, which specifically includes:
s1, each multicast receiver acquires the attribute of the multicast receiver and a private key corresponding to the attribute of the multicast receiver, which is generated according to a CP-ABE algorithm;
s2, determining a target multicast receiver by a multicast source, formulating a decryption strategy (such as id >2 and level > 1) according to the attribute of the target multicast receiver, randomly generating an AES key, generating a ciphertext strategy tree according to strategy generation conditions, wherein the strategy generation conditions comprise the AES key and the decryption strategy, and requiring the multicast receiver capable of decrypting to obtain multicast data in a data transmission task pointed by the target multicast receiver;
s3, the multicast source encrypts the multicast data according to the AES key to generate ciphertext data;
s4, binding the ciphertext policy tree and the ciphertext data together by the multicast source to generate a network data packet, and then replacing plaintext data to be transmitted originally with the network data packet and sending the network data packet to all multicast receivers;
s5, each multicast receiver analyzes the ciphertext strategy tree and ciphertext data from the network data packet;
s6, each multicast receiver decrypts the ciphertext policy tree according to own decryption conditions, wherein the decryption conditions comprise a private key generated according to the attributes of the multicast receivers, if the attributes of the receivers do not accord with the decryption policy formulated by the multicast sender, the AES key cannot be decrypted, and if the decryption fails, the AES key can be correctly decrypted only if the attributes of the receivers accord with the decryption policy formulated by the multicast sender, in the embodiment, only the attributes of the target multicast receivers are matched with the ciphertext policy tree, and the AES key can be decrypted from the private key;
s7, the target multicast receiver decrypts the ciphertext data by adopting the AES key to obtain plaintext multicast data.
In this embodiment, the multicast receiver includes a terminal 1, a terminal 2, a terminal 3, and a terminal 4. The multicast receiver needs to acquire its own attribute and attribute-based private key in advance, for example, the attribute of the multicast receiver terminal 1 is Att 1 (id=001, level=1), the corresponding private key is: priv 1 . Wherein the attribute may be public and the private key cannot be leaked.
In this embodiment, the policy generation conditions further include a random number s and a public parameter, where the random number is generated by the multicast source, and the public parameter refers to a parameter required by the CP-ABE algorithm; the decryption conditions also include public parameters.
In this embodiment, the public parameters, the attributes of each multicast receiver, and the private key are generated by the PKG server, and the public parameters and the attributes of each multicast receiver are disclosed by the PKG server in the network where the multicast group is located.
In this embodiment, the distribution manner of the attribute and the private key generated by the PKG server is: after being stored in the Ukey, the multicast data is copied offline to each multicast receiver.
In this embodiment, the AES key is a symmetric key, and the multicast data is encrypted or decrypted using the AES algorithm. In addition, other symmetric encryption algorithms such as DES, RC4 and the like can be used for encryption or decryption.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A multicast data transmission method with ciphertext strategies embedded in a message is characterized by comprising the following steps:
s1, each multicast receiver acquires the attribute of the multicast receiver and a private key corresponding to the attribute of the multicast receiver, which is generated according to a CP-ABE algorithm;
s2, the multicast source determines a target multicast receiver, randomly generates an AES key, formulates a decryption strategy according to the attribute of the target multicast receiver, and generates a ciphertext strategy tree according to strategy generation conditions, wherein the strategy generation conditions comprise the AES key and the decryption strategy;
s3, the multicast source encrypts the multicast data according to the AES key to generate ciphertext data;
s4, binding the ciphertext policy tree and ciphertext data together by the multicast source to generate a network data packet, and transmitting the network data packet to all multicast receivers;
s5, each multicast receiver analyzes the ciphertext strategy tree and ciphertext data from the network data packet;
s6, each multicast receiver decrypts the ciphertext policy tree according to the decryption condition of the multicast receiver, wherein the decryption condition comprises a private key generated according to the attribute of the multicast receiver, and only the attribute of the target multicast receiver is matched with the ciphertext policy tree and can decrypt the ciphertext policy tree to obtain an AES key;
s7, the target multicast receiver decrypts the ciphertext data by adopting the AES key to obtain plaintext multicast data;
the strategy generation condition also comprises a random number and a public parameter, wherein the random number is generated by a multicast source, and the public parameter refers to a parameter required by a CP-ABE algorithm; the decryption conditions also include public parameters;
the public parameters are generated by a PKG server and are disclosed in a network where a multicast group is located;
the attribute and the private key of each multicast receiver are uniformly generated by a PKG server;
the attribute and the private key generated by the PKG server are offline copied to each multicast receiver after being stored in the Ukey;
the attributes of each multicast receiver are disclosed by the PKG server in the network where the multicast group is located.
2. The method for transmitting multicast data by embedding ciphertext policies in a message as recited in claim 1, wherein the target multicast receiver requests a multicast receiver capable of decrypting the received multicast data in a data transmission task.
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